Defensive publication



DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice of Dec.16, 1969, 869 O.G. 687. The abstracts of Defensive Publicationapplications are identified by distinctly numbered series and arearranged chronologically. The heading of each abstract indicates thenumber of pages of specification, including claims and sheets ofdrawings contained in the application as originally filed. The files ofthese applications are available to the public for inspection andreproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The Patent Ofllce makes no assertion as tothe novelty of the disclosed subject matter.

PUBLISHED MARCH 31, 1970 T872 012 PROCESS OF SOLVENT POLISHING PLASTICMOLDED ARTICLES Clay D. Holt, P.0. Box 511, Kingsport, Tenn. 37662Continuation of application Ser. No. 684,537, Nov. 20, 1967. Thisapplication Oct. 20, 1969, Ser. No. 867,969 Int. Cl. B29c 25/00; B44d/10 US. Cl. 264-341 No Drawing. 11 Pages Specification Plastic articlesare smoothed and polished by applying a mixture of low and high boilingcomponents and oven heating. Neither component is a solvent until thearticle is heated. As the low boiling component boils away, it removessurface blemishes while the high boiling component keeps the surfacesoft and fiowable until all blemishes disappear. Injection moldedcellulose acetate (CA), or its propionate (CAP) or butyrate (CAB) withflaws, mold flash and surface strain may be treated with a liquid of 80to 99% low boiling solvent (200 F., or lower) and to 1% higher boilingsolvent (over 200 R, up to 350 F.) by dipping, spraying, roller, orbrush at or below F. After contact for 20 sec. to 4 min., excess solventmay be spun off and the article is placed in an oven for 1 to 4 min. ator above the boiling point of the lowest boiling solvent to 300 F.).Examples are: (1) CAB with toluene 90%, tetrachlorocthylene 5%,tributyrin 5%, one min. at room temp. (RT), two min. at 250 F.; (2) CABwith trichloroethylene 98%, ethylene glycol diacetate 2%, three min. atRT, three min. at (3) CAP with trichloroethylene 90%, ethyleneglycoldiacetate 10%, three min. at RT, three min. at 195 F.; (4) CA withtrichloroethylene 90%, methyl Cellosolve acetate 10%, two min. RT, threemin. at 195 F. Xylene and naphthylene/triacetin are other, low/highboilers respectively.

